Performance of Adaptive Multiuser Detectors in Space-Time Coded CDMA Systems

Alam, MM and Chockalingam, A (2003) Performance of Adaptive Multiuser Detectors in Space-Time Coded CDMA Systems. In: 14th IEEE 2003 Personal, Indoor and Mobile Radio Communications, 7-10 September, Beijing,China, Vol.2, 1824 -1828.

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Abstract

In this paper, we present a comparative performance evaluation of adaptive multiuser detectors, including stochastic gradient (SG) and recursive least squares (RLS) algorithms (which require training data), and minimum output energy (MOE) and subspace-based MMSE (S-MMSE) algorithms (which do not require training data), under near-far conditions in a space-time coded CDMA system. VVe show that, in a near-far multiuser scenario, increasing the number of transmit antennas degrade the near-far resistance performance of the SG and MOE detectors significantly at high near-far ratios, to the extent that the diversity benefit of multiple transmit antennas is ified. The RLS and S-MMSE algorithms, on the other hand, are shown to maintain their near-far resistance without loosing much on the diversity gain, when the number of transmit antennas is increased.

Item Type:	Conference Paper
Publisher:	IEEE
Additional Information:	�©1990 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Keywords:	Space-time codes;CDMA;Adaptive multiuser detection
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	23 Dec 2005
Last Modified:	19 Sep 2010 04:22
URI:	http://eprints.iisc.ac.in/id/eprint/4753

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